Verfahren zum Korrosionsschutz von Bauteilen aus warmfestem Stahl

Disclosed is a method for protecting parts that are made of creep-resistant steel, especially boiler tubes made of a chromium steel such as P91, from corroding. According to said method, the surface that is to be protected is treated with a gas containing SiCl4 in a nonoxidizing atmosphere at a temp...

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Bibliographische Detailangaben
Hauptverfasser:	MAILE, KARL, LYNTORICH, ABRAM, BERRETH, KARL
Format:	Patent
Sprache:	ger
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	Disclosed is a method for protecting parts that are made of creep-resistant steel, especially boiler tubes made of a chromium steel such as P91, from corroding. According to said method, the surface that is to be protected is treated with a gas containing SiCl4 in a nonoxidizing atmosphere at a temperature ranging between 1000 °C and 1200 °C by means of a CVD process. The treatment with SiCl4 is performed in several successive treatment cycles (26) between which diffusion cycles (28) are interposed.